"This afternoon [Friday] I got the report his headless body was found... We have confirmed from villagers that it is him," he said.

Myanmar soldiers have taken control of the dangerous and remote region bordering Bangladesh since October 9 when armed men raided police posts, killing nine officers.

Troops have killed more than 80 people in Rakhine since the start of crackdown, according to official figures.

Conflict analysts at the International Crisis Group say fighters behind the border post attacks have also killed several Rohingya "informers" perceived to be working with Myanmar authorities.

At least 34,000 Rohingya Muslims have since fled to Bangladesh, taking with them allegations of mass-killings, rape, and torture at the hands of Myanmar's security forces.

The Myanmar government has vigorously denied the accusations, setting off the latest war of words over a stateless minority whose status is one of the country's most incendiary issues.

Rare media tour

In a statement Friday, the president's office confirmed that a man - whom they identified as Shu Nar Myar - had been killed, adding he had denied stories of military abuse when speaking to the reporters.

"Shu Nar Myar is the one who revealed that there was no case of arson by the military and police forces, no rape and no unjust arrests," the statement said.

Two Burmese reporters, who did not want to be named, told AFP they interviewed the man on Wednesday at his village and had been contacted by police to say he was missing.

The rare media tour of the area - open only to Burmese journalists - was organised by the government amid mounting pressure on de-facto civilian leader Aung San Suu Kyi to allow access to the conflict zone.

Reality Check: Aung San Suu Kyi's shameful silence on the Rohingya

Her government has responded to growing international alarm over the crisis with a dogged information campaign aimed at batting back reports of military abuse.

Northern Rakhine has been under lockdown for more than two months since the hundreds of armed men launched surprise attacks on border posts.

The International Crisis Group says the attackers are from a Saudi-backed group called Harakah al-Yaqin, which emerged after a wave of sectarian violence cut through Rakhine in 2012.

The Rohingya have languished under years of dire poverty and discrimination from a government that denies them citizenship.

The United Nations and other rights groups have repeatedly called on Myanmar to grant them full rights, describing the Rohingya as one of the world's most persecuted minorities.